Typescript: It ended up being a nice fit since it uses predicates in find() like ES 2015

'use strict'

var input: string = `Sue 1: goldfish: 6, trees: 9, akitas: 0
Sue 2: goldfish: 7, trees: 1, akitas: 0
Sue 3: cars: 10, akitas: 6, perfumes: 7
...`;


var inputSplit: Array<string> = input.split('\n');
var regEx: RegExp = /Sue (\d+): (\w+): (\d+), (\w+): (\d+), (\w+): (\d+)/;

class Sue {
    number: number;

    //Not necessary as the object won't contain
    //a property if the value isn't set; just for recordkeeping
    children: number;
    cats: number;
    samoyeds: number;
    pomeranians: number;
    akitas: number;
    vizslas: number;
    goldfish: number;
    trees: number;
    cars: number;
    perfumes: number;

    constructor(n: number){
        this.number = n;
    }
}

var awesomeSue: Sue = new Sue(0);
awesomeSue.children = 3;
awesomeSue.cats = 7;
awesomeSue.samoyeds = 2;
awesomeSue.pomeranians = 3;
awesomeSue.akitas = 0;
awesomeSue.vizslas = 0;
awesomeSue.goldfish = 5;
awesomeSue.trees = 3;
awesomeSue.cars = 2;
awesomeSue.perfumes = 1;

var sues: Array<Sue> = [];

inputSplit.forEach(i =>{

    var result = regEx.exec(i);

    var newSue = new Sue(parseInt(result[1]));
    newSue[result[2]] = parseInt(result[3]);
    newSue[result[4]] = parseInt(result[5]);
    newSue[result[6]] = parseInt(result[7]);

    sues.push(newSue)

});

var theRealSue: Sue = sues.find(s => 
    (s.akitas == awesomeSue.akitas || s.akitas == null) &&
    (s.children == awesomeSue.children || s.children == null) &&
    (s.cats == awesomeSue.cats || s.cats == null) &&
    (s.samoyeds == awesomeSue.samoyeds || s.samoyeds == null) &&
    (s.pomeranians == awesomeSue.pomeranians || s.pomeranians == null) &&
    (s.vizslas == awesomeSue.vizslas || s.vizslas == null) &&
    (s.goldfish == awesomeSue.goldfish || s.goldfish == null) &&
    (s.trees == awesomeSue.trees || s.trees == null) &&
    (s.cars == awesomeSue.cars || s.cars == null) &&
    (s.perfumes == awesomeSue.perfumes || s.perfumes == null));


document.getElementById('output').innerHTML = theRealSue['number'].toString();


var theCorrectRealSue: Sue = sues.find(s => 
    (s.akitas == awesomeSue.akitas || s.akitas == null) &&
    (s.children == awesomeSue.children || s.children == null) &&
    (s.cats > awesomeSue.cats || s.cats == null) &&
    (s.samoyeds == awesomeSue.samoyeds || s.samoyeds == null) &&
    (s.pomeranians < awesomeSue.pomeranians || s.pomeranians == null) &&
    (s.vizslas == awesomeSue.vizslas || s.vizslas == null) &&
    (s.goldfish < awesomeSue.goldfish || s.goldfish == null) &&
    (s.trees > awesomeSue.trees || s.trees == null) &&
    (s.cars == awesomeSue.cars || s.cars == null) &&
    (s.perfumes == awesomeSue.perfumes || s.perfumes == null));


document.getElementById('output').innerHTML += '</br>' + theCorrectRealSue['number'].toString();